Renew yarn keys before apt-get update to avoid errors
Renew yarn keys before apt-get update to avoid errors

Summary:
Yarn key had expired on 2nd of February. The owner has renewed it, but seems like Circle CI still has the old one cached. (see https://github.com/yarnpkg/yarn/issues/6865#issuecomment-772047314)

Changelog: [Internal]

Reviewed By: fkgozali

Differential Revision: D26276386

fbshipit-source-id: 093c7de94445b6ff9beb5792b16564e5c3bd1234

javache/react-native,javache/react-native,facebook/react-native,myntra/react-native,javache/react-native,facebook/react-native,janicduplessis/react-native,myntra/react-native,myntra/react-native,arthuralee/react-native,janicduplessis/react-native,pandiaraj44/react-native,myntra/react-native,arthuralee/react-native,javache/react-native,pandiaraj44/react-native,pandiaraj44/react-native,janicduplessis/react-native,pandiaraj44/react-native,pandiaraj44/react-native,facebook/react-native,myntra/react-native,janicduplessis/react-native,javache/react-native,myntra/react-native,pandiaraj44/react-native,myntra/react-native,janicduplessis/react-native,facebook/react-native,janicduplessis/react-native,facebook/react-native,javache/react-native,myntra/react-native,facebook/react-native,javache/react-native,arthuralee/react-native,javache/react-native,facebook/react-native,myntra/react-native,facebook/react-native,pandiaraj44/react-native,pandiaraj44/react-native,janicduplessis/react-native,arthuralee/react-native,javache/react-native,facebook/react-native,arthuralee/react-native,janicduplessis/react-native